Shortcuts

Transparent menus -- not possible?

I want to use a single image as the background for my whole TabStrip but I can't seem to make the individual tabs transparent via CSS styles. I don't want
any background colors for the tabs, but setting the tabs to transparent (i.e. in the tab styles use
background-color: transparent) didn't work.

I tried setting a background-image at the TabStrip CssClass but that had no effect. Other style attributes work, like
border, but not background-image.